1. The reported securities are directly owned by certain private investment vehicles managed by Discovery Capital Management, LLC and may be deemed beneficially owned by Discovery Capital Management, LLC as the investment manager of such private investment vehicles and also may be deemed beneficially owned by Robert K. Citrone, as the Managing Member of Discovery Capital Management, LLC. The Reporting Persons disclaim beneficial ownership of the reported securities except to the extent of his or its pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

2. The reported securities are directly owned by certain private investment vehicles managed by an entity of which Robert K. Citrone is a managing member and therefore, may be deemed beneficially owned by Robert K. Citrone, in his capacity as a managing member. The Reporting Person disclaims beneficial ownership of the reported securities except to the extent of his pecuniary interest therein, and this report shall not be deemed an admission that such Reporting Person is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

3. These securities are directly owned by Robert K. Citrone.

4. On May 3, 2012, a private investment vehicle managed by an entity of which Robert K. Citrone is a managing member entered into an equity swap agreement with a securities broker (the "Swap Agreement"). The Swap Agreement references a basket of securities, including 48,200 shares of the Issuer's Common Stock. Under the agreement, the securities broker agreed to pay the investment vehicle an amount equal to any increase, and the investment vehicle agreed to pay the securities broker an amount equal to any decrease, in the official market price of Swap Agreement's underlying securities. The reference price of the Issuer's Common Stock in the Swap Agreement is US$40.51 per share upon close-out of any transaction.